#include <iostream>
#include <cstdio>

int main(){
  printf("hello printf->stdout\n");
  fprintf(stdout, "hello printf->stdout\n");
  fprintf(stderr, "hello fprintf->stderr\n");

  //C++
  std::cout << "hello cout -> cout" << std::endl;
  std::cerr << "hello cerr -> cerr" << std::endl;
  return 0;
}
